Goodwill and Other Intangible Assets (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011	Jan. 28, 2012
Goodwill and Intangible Assets
Pretax amortization expense associated with intangible assets	$ 0.8	$ 0.8	$ 1.6	$ 1.7	$ 3.4
Pretax amortization expense associated with intangible assets, 2012	1.7		1.7
Pretax amortization expense associated with intangible assets, 2013	3.2		3.2
Pretax amortization expense associated with intangible assets, 2014	3.1		3.1
Pretax amortization expense associated with intangible assets, 2015	3.1		3.1
Pretax amortization expense associated with intangible assets, 2016	$ 3.1		$ 3.1